Motion-picture film



Sept. 11, I928.

' M. KRASLAVSKY MOTION PICTURE FILM Filed Aug. 31

INVENTOR 7 laws/Q5,

flK

A TTORNEY,

- l .inforcing material. H It is a more. particular object of'the' inven-:

tion to provide a reinforcement for filmsl-in' the form of a continuousstripof ,flexiblerma-z teria'l incorporated in the edge portions of thefilm intermediate of its opposite side faces 'so' 2 superimposed Patented Sept. 1928.

UNITED STATES PATENT OFFICE.

NICKEL KBASLAYSKY, OF NEW YORK, N. YI NO'W BY CHANGE OF NAME MITCHELL x3 8 SS. 1 .a

uorron-rrc'rnna rinmf Application m new a1; 1925. are; 1T0. 58,458.

- This invention relates to motion picturefilms, and hasfor itsprimary object to provide an improved reinforcing means forthe perforated. edges of the film to prevent muti- 5. lation ortearing of the film in the engage-' [0 for the edges of t e film which may be em bodied or.inc0rporated therein during the process of manufacture of the film whereby an indissolublebondis effected-between the gelatinous substance of. the film and the re-' that the film itself protects therein rci'ng material against excessive wear, and t e filmremains of uniform thickness" throughout,

so that in rollin the film the surfacestof the convolutions-will have close contact with each other'. 6 With the'above and other objects in View,

. the inventionconsist's in'the improved motion picture film and the several structural features thereof as will be hereinafter more fully described, illustrated in the accompany- .ing drawing, and subsequently incorporated r in the subjomed claims. 7 Inthe drawing, whereinI have illustrated .15. Oflesimple and practical embodiment of the invention, and in which similar ireference characters represent corresponding; throughout the several 'views,i--

Fi' 1 is a pl'an view of asection of 40 provlded' with my improved reinforcement,"

- corporated therein. While I have referred to 1 th'eseieinfoiting strips as preferably of silk or other fabric material, it isv possible that Fig. 2 is a sectional view taken on the line 2-2 of-Fig. 1'.-

In the operation of motion picture taking 4 and projecting machines aninterru ted or, step by step movement isimparted to he film e light aperture by sprocket teeth or past t other mechanical means engaging the perforated edges of the film. y reason thereof, the edge of the film at the perforations freq uently become badly torn or mutilated. Various means have been suggested for reinforcing the edges of the film, which howeirerghave not been found entirely successful an are also more or less diflicult of application.

-- ted, woven or textile fabric suchias a' heavy vserved that "applied and the film material has cooled-and set, the film is then run through a perforating thereof the 'perforations of breaking the I It is thepurpose of my present improvements .to provide a reinforcement for the perforated ,edgesof the film which is permanently bonded in thebody ofthe film material and which may-be readily. applied in the process of man- .ufacture :of t e film.

6 process f manufacture of the filmand while the'film aterial is in a plastic or semi-plastic state as it is flowed upon the film receiving surface, two relatively narrow strips 5 of netgrade of silk as indicated at 6, are fed in parallel relation with the film material so that these fabric strips occupy positions along the longitudinal borders of the film mass and intermediate of the opposite side faces thereof as clearly shown in Fig. 2 of the drawings.

The. filmmaterial entering the interstices ofthe fabric strips from opposite sides thereof, forms an indissoluble'bond with said fabv ric relnforeing strips so that there is. no cs sibility of separation of the individual fi rs 19f said reinforcing'strips from their 'iiiterv #woven relation with each other or from the body of the material. Also, it will be obe completed film s of uniform; thickness throughout its area andthe oppo-'- s teside' faces thereof are perfectly smooth -&

anduninterrupted."

the reinforcing strips have thusbeen machine 'to provide in the opposite edges spaced sprocket teeth receiving. e'xtendingthrough the film and the intermediate reinforcing strips 6 in-- as otherflexible non fabric-materials mightbe used, such for instance as tin foil .or the-like, and it will, therefore, be understood that in carrying out my invention, I not, in all cases desire to. berestricted tothe use of the (fabric, or textile reinforcement for the film I. a l i x I I I 106 In will be apparent that 'a film when reinforced in the manner above described is ma-.

terially strengthened in its resistance to teng'the possibility {while at the same time 110 sile strains thereb minimizin a very strong reinforcement is provided for the individual film perforations so that said perforations will not be elongated by the sprocket teeth and the film torn or mutilated.

Since the reinforcing strips are not applied to the surfaces of' the film, but ,are incorporated within the body thereof, the reinforc-' ing "material itself is protected a ainst excessive wear by the engagementof t e feed or take-up sprocket teeth therewith'and the possibility of the individual fibers of the reinforcing strips becoming separated and pro-" jectingfrom the film perforations is obviated.

A reinforced motion picture film of this con r struction can be very inexpensively producedin the process of manufactureand no re-heating of the edges ofthe film or the use of cementitious material is required in the application of the reinforcementto the edges of the with the surfaces-of the superimposed film "/5 film Further, since the side faces of the film are-smooth and uninterrupted and said film is of uniform thickness' throughout its area it can be closely coiled or wound in-a roll convolutions in uniform contact throughout with each other and since the reinforcement ing, the construction and several advantages of m improved motion picture film will be clear y understood. As above suggested,

while I have herein disclosed one simple and practical embodiment of the invention, the same is nevertheless, susceptible of'considerable modification both in the particular form of the reinforcing means employed and the structure thereof, and also in the manner of its application. Accordingly, it will be unclerstood that I reservethe privilege of reall such legitimate changes as may sorti'ng' to and relatively narrow and thin strips of woven silk fabric embedded in the longitudinal edge portions of the film body and being wholly enclosed by. said film body, the body material entering-into the meshes of the silk fabric. V

2. An improved motion picture filmcomprising afpyro'xylin film-body, andrelativcly thin and narrow. strips of flexible textile mg: terial having meshes therein into which t e pyroxylinmaterial enters to form an indiesoluble bond, said strips being embedded within the longitudinal edge portions'of the film body and being'exposed only upon the opposite edge portions 1 of said .filmc body, said embedded fabric strips and the encasing edge portions of the film body being perforated.

' In testimony that I claim the foregoing as my invention, I have signed m name hereto." MICHELKRA LAVSKY. 

